package com.example.common.view.view

import android.content.Intent
import android.os.Bundle
import androidx.activity.result.contract.ActivityResultContracts
import androidx.databinding.ViewDataBinding
import com.example.base.view.BaseActivity
import com.example.common.view.event.CustomEvent
import org.greenrobot.eventbus.EventBus
import org.greenrobot.eventbus.Subscribe
import org.greenrobot.eventbus.ThreadMode

//MVVM架构下的BaseActivity模式
abstract class BaseMvvmActivity<VDB:ViewDataBinding>:BaseActivity<VDB>() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        //获取数据
        loadData()
        //订阅数据
        observeDataChanged()
        //EventBus事件总线
        EventBus.getDefault().register(this)
    }

    //接收事件
    @Subscribe(threadMode = ThreadMode.MAIN)
    public fun onReceiveEvent(event: CustomEvent?){
        //校验是否为当前页面接收事件
        if (event!=null&&event.target==this.javaClass.simpleName){
            handEvent(event)
        }
    }

    override fun onDestroy() {
        super.onDestroy()
        //反注册,防止内存溢出
        EventBus.getDefault().unregister(this)
    }
    //获取的启动器
    private val resultLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()){result->
        //成功返回(下一页使用setResult返回值)
        if(result.resultCode== RESULT_OK){
            result.data?.let {
                handActivityResult(it)
            }
        }
    }
    //启动下一个Activity并接收返回结果
    protected open fun startNextActivityForResult(intent: Intent?){
        //相当于startActivity(this)
        resultLauncher.launch(intent)
    }
    //子类获取页面返回Intent对象,并从中获取
    protected open fun handActivityResult(data:Intent){

    }

    //系统提供Api实现页面之间传值
    protected open fun startNextActivity(intent: Intent?){
        intent?.run {
            startActivity(this)
        }
    }
    protected open fun startNextActivityForResult(intent: Intent?,requestCode:Int){
        intent?.run {
            startActivityForResult(this,requestCode)
        }
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        receiveNextForResult(requestCode,resultCode,data)
    }
    protected open fun receiveNextForResult(requestCode: Int, resultCode: Int, data: Intent?){

    }
    //可以根据业务需要重写方法
    protected open fun loadData(){

    }
    //可以根据业务需要重写方法
    protected open fun observeDataChanged(){

    }
    //交给子类处理事件
    protected open fun handEvent(event: CustomEvent){

    }
}